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  <title>Qt 4.3: Qt 3 Support Members for QCoreApplication</title>
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<p><b>The following class members are part of the <a href="qt3support.html">Qt 3 support layer</a>.</b> They are provided to help you port old code to Qt 4. We advise against using them in new code.</p>
<p><ul><li><a href="qcoreapplication.html">QCoreApplication class reference</a></li></ul></p>
<h3>Public Functions</h3>
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<li><div class="fn"/>void <b><a href="qcoreapplication-qt3.html#lock">lock</a></b> ()</li>
<li><div class="fn"/>bool <b><a href="qcoreapplication-qt3.html#locked">locked</a></b> ()</li>
<li><div class="fn"/>bool <b><a href="qcoreapplication-qt3.html#tryLock">tryLock</a></b> ()</li>
<li><div class="fn"/>void <b><a href="qcoreapplication-qt3.html#unlock">unlock</a></b> ( bool <i>wakeUpGui</i> = true )</li>
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<li><div class="fn"/>8 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
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<h3>Static Public Members</h3>
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<li><div class="fn"/>int <b><a href="qcoreapplication-qt3.html#enter_loop">enter_loop</a></b> ()</li>
<li><div class="fn"/>void <b><a href="qcoreapplication-qt3.html#exit_loop">exit_loop</a></b> ()</li>
<li><div class="fn"/>int <b><a href="qcoreapplication-qt3.html#loopLevel">loopLevel</a></b> ()</li>
<li><div class="fn"/>void <b><a href="qcoreapplication-qt3.html#processOneEvent">processOneEvent</a></b> ()</li>
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<h2>Member Function Documentation</h2>
<h3 class="fn"><a name="enter_loop"></a>int QCoreApplication::enter_loop ()&nbsp;&nbsp;<tt> [static]</tt></h3>
<p>This function enters the main event loop (recursively). Do not call it unless you really know what you are doing.</p>
<h3 class="fn"><a name="exit_loop"></a>void QCoreApplication::exit_loop ()&nbsp;&nbsp;<tt> [static]</tt></h3>
<p>This function exits from a recursive call to the main event loop. Do not call it unless you are an expert.</p>
<h3 class="fn"><a name="lock"></a>void QCoreApplication::lock ()</h3>
<p>In Qt 3, this function locked the Qt library mutex, allowing non-GUI threads to perform basic printing operations using <a href="qpainter.html">QPainter</a>.</p>
<p>In Qt 4, this is no longer supported, since painting is only supported from within a paint event handler. This function does nothing.</p>
<p>See also <a href="qwidget.html#paintEvent">QWidget::paintEvent</a>().</p>
<h3 class="fn"><a name="locked"></a>bool QCoreApplication::locked ()</h3>
<p>This function does nothing. It is there to keep old code working. It always returns false.</p>
<p>See <a href="qcoreapplication-qt3.html#lock">lock</a>() for details.</p>
<h3 class="fn"><a name="loopLevel"></a>int QCoreApplication::loopLevel ()&nbsp;&nbsp;<tt> [static]</tt></h3>
<p>Returns the current loop level.</p>
<h3 class="fn"><a name="processOneEvent"></a>void QCoreApplication::processOneEvent ()&nbsp;&nbsp;<tt> [static]</tt></h3>
<p>Waits for an event to occur, processes it, then returns.</p>
<p>This function is useful for adapting Qt to situations where the event processing must be grafted onto existing program loops.</p>
<p>Using this function in new applications may be an indication of design problems.</p>
<p>See also <a href="qcoreapplication.html#processEvents">processEvents</a>(), <a href="qcoreapplication.html#exec">exec</a>(), and <a href="qtimer.html">QTimer</a>.</p>
<h3 class="fn"><a name="tryLock"></a>bool QCoreApplication::tryLock ()</h3>
<p>This function does nothing. It is there to keep old code working. It always returns false.</p>
<p>See <a href="qcoreapplication-qt3.html#lock">lock</a>() for details.</p>
<h3 class="fn"><a name="unlock"></a>void QCoreApplication::unlock ( bool <i>wakeUpGui</i> = true )</h3>
<p>In Qt 3, this function unlocked the Qt library mutex. The mutex allowed non-GUI threads to perform basic printing operations using <a href="qpainter.html">QPainter</a>.</p>
<p>In Qt 4, this is no longer supported, since painting is only supported from within a paint event handler. This function does nothing.</p>
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